. >> is it something that came from the environment or is it concentrated enough to make you lead you to believe they came from the bomb. >> i believe they came from the bomb but i can't be sure. >> how many amputations have you performed and how many are planned? >> if i have my numbers are right, we have performed four amputations and there are two more limbs that are at risk, but i hope that we will save those l legs. [ inaudible question ] yes, they are in intensive care. they are in critical condition. but at this point we have stabilized their vital signs and their hemodynamic situation is under control. >> what are their injuries, can you describe what has placed them in such critical condition? >> most of the injuries were, again, lower extremity major injuries. from these injuries they bled a lot. we controlled the bleeding rather rapidly, but certainly they lost a lot of blood and that created d physiologic problems. [ inaudible question ] as far as i know, all of them are americans. >> can you tell us an age range, doctor, of your patients? >> the younger patient so far was